but with changing technology. i think we can also keep america safe. if we have american citizens that are alert and sensitive to these challenges, that can be very, very help fful to the law enforcement community. but clearly we can accommodate security. in a society like ours where we enjoy so many freedoms, to expect to be 100% safe is unrealistic. we're clearly safer today than on 9/11. we have done a lot to make america safer today, but we will never be safe in a society like ours. >> when you profile, are there often people that come and you know they have done or suspect heavily they have done something and showed no signs of it. >> yes. >> really? aparentally the younger brother who everyone said he was a normal guy. he went back to partying after this happened. what does that tell you? >> it's my understanding that the parents went back to russia and left the older boy in charge of the younger boy. even though the younger boy is only 19, he's still an adult. so of course, the parents are free to go. but it's a 19-year-old who is still young an